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Preparation method for sebacic acid

A technology of sebacic acid and sulfuric acid, which is used in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high toxicity of diluents, high production costs, affecting the implementation of industrialization, etc., to eliminate environmental problems. Contamination issues, lower production costs, the effect of simplifying the recycling process

Active Publication Date: 2012-02-15
上海华谊工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technology provided by this patent has the defect of difficult separation and recovery of compound acid diluent, which affects the implementation of industrialization
[0009] (3) US 6392074 discloses a method for preparing sebacic acid from ricinoleic acid without phenol. The patent diluent adopts a single, branched chain fatty acid, alcohol or aldehyde, and the yield of sebacic acid is about 43%. , this method also has the defect that diluent separation and recovery are difficult
[0010] It can be seen that the current technology has problems such as high toxicity of the diluent, difficulty in recycling and reuse, difficulty in the treatment of production wastewater, and high production costs, which cannot meet the needs of relevant industrial sectors.

Method used

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  • Preparation method for sebacic acid
  • Preparation method for sebacic acid

Examples

Experimental program
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Embodiment 1

[0049] use figure 1 process.

[0050] (1) 0.5 kg of ricinoleic acid, 0.025 kg of capric acid and 0.55 kg of sodium hydroxide solution with a mass concentration of 45% were added to the reactor, stirred, heated to 340° C., and the reaction time was 4 hours, and the ricinoleic acid was cracked to generate Disodium sebacate, sec-octanol, hydrogen, and sodium capric acid;

[0051] The mass ratio of ricinoleic acid, capric acid and sodium hydroxide solution is 1: 0.05: 1.1;

[0052] Disodium sebacic acid and sodium capric acid enter the liquefaction tank;

[0053] (2) Sebacic acid double sodium salt, decanoic acid sodium cracking material are miscible with water in the liquefaction tank, and the water temperature is controlled at 80 ℃ and then beaten into the neutralization tank, and the sulfuric acid neutralizing material liquid with a mass concentration of 93% is adjusted To pH = 6.5, an oily phase of decanoic acid, and an aqueous phase containing monosodium sebacic acid were ...

Embodiment 2

[0064] use figure 1 process.

[0065] (1) 0.5 kg of ricinoleic acid, capric acid and mass concentration of 50% sodium hydroxide solution are added to the reaction kettle, stirred, heated to 260°C, and the reaction time is 5 hours, and the ricinoleic acid is cracked to generate sebacic acid bis Sodium salt, 2-octyl alcohol, hydrogen gas and sodium capric fatty acid;

[0066] The mass ratio of ricinoleic acid, capric acid and sodium hydroxide solution is 1: 0.02: 1.1;

[0067] Disodium sebacic acid and sodium capric acid enter the liquefaction tank 2;

[0068] (2) disodium sebacic acid, sodium capric acid are miscible with water in the liquefaction tank, and the temperature is controlled at 90°C, then they are beaten into the neutralization tank, and the sulfuric acid neutralizing feed solution with a mass concentration of 50% is to pH= 6.5. Obtain the oil phase decanoic acid and the water phase containing sebacic acid monosodium salt, and then collect the target product seba...

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Abstract

The invention provides a preparation method for sebacic acid, which comprises the following steps: (1) adding ricinoleic acid, a diluent decanoic fatty acid and a sodium hydroxide solution in a reaction vessel for heating reaction, generating sebacic acid disodium salt, octanol, hydrogen and decanoic fatty acid sodium, (2) mixing and dissolving sebacic acid disodium salt, decanoic fatty acid, decanoic fatty acid sodium and water, placing into a neutralizing tank for neutralizing by sulfuric acid to obtain water phase of sebacic acid monosodium salt, then adding sulfuric acid into water phase, reacting and collecting the target product sebacic acid. The method of the invention reduces the difficulty of waste water treatment and the production cost which has the advantages of energy saving and consumption reduction, decanoic fatty acid is a by-product of sebacic acid production as well as a diluent which has the advantages of repeated usage and convenient recovery, no extra impurity is introduced in the production process, the product has good quality, and the major product sebacic acid, co-product octanol and by-product decanoic fatty acid have good quality.

Description

technical field [0001] The invention relates to a method for preparing sebacic acid using ricinoleic acid as a raw material. Background technique [0002] Sebacic acid is an important fine chemical intermediate, which is widely used in the chemical industry. Such as used in the production of nylon engineering plastics, cold-resistant plasticizers, high-temperature-resistant lubricants, etc. [0003] The traditional preparation process of sebacic acid is to use phenol as diluent to crack ricinoleic acid with alkali. The production route of this process is mature, but there is a problem of phenol pollution. Due to the high toxicity of phenol, the difficulty in the treatment of phenol-containing wastewater, and the large environmental pollution, it is the primary problem restricting the development of the industry. [0004] At present, the technologies in the phenol-free production of sebacic acid mainly include: [0005] (1) Chinese patent 200810014392.1 discloses a new pro...

Claims

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Application Information

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IPC IPC(8): C07C55/20C07C53/126C07C51/00
Inventor 张振武张一帆
Owner 上海华谊工程有限公司
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